As discussed by [1]}, detailed analysis of the momentum budget in the outflow southern lobe showed that the high-velocity jet carries away the same amount of momentum as the low-velocity gas (1.7 vs \(2.6\hbox{\hspace{1.99997pt}$M_\odot $}\hbox{\hspace{1.99997pt}km\hspace{1.99997pt}s$^{-1}$}\) , respectively). This led the authors to conclude that the low-velocity outflow is driven by the protostellar jet itself. This result is supported by the distribution of the CO emission in the Position-Velocity diagram along the main jet axis. As can be seen in the top panel of Fig. REF , the low-velocity gas appears to accelerate gradually from the protostar up to the terminal shock HH377 following a "Hubble law" relation: \((V-V_{lsr}) \propto \delta \)  where \(\delta \)  is the angular distance to the protostar. This kinematical feature is an unambiguous signature of jet bowshock driven outflow [2]}, [3]}, [4]}.
